Joseph olmsted



(NoModeL) OLMSTED,

TELEPHONE TRANSMITTER.

No. 252,132. Patented Jan. 10,1882.

ATTEBT: INVENTOHII wmsxwm. T T 6A WMM JIM/2% 4,

JOSEPH oLMsTan, on NEW YORK, N.Y.

TELEPHONE-TRANSMITTER.'

par1: of Letters SPECIFICATION forming ljatent Nb. 252,132, datedJanuary 10, 1882.

Application filed Octoher 14, 1881. (No model.)

Toall whom it may concern: j l

Be it [known that I, JOSEPH OLMSTED, a' citizen of the United States,residing in'New 3 York, county of New York, and State of New York, haveinvented a new and useful Telephone-Transmitter, of which the followingis a specification, j l

Myinventiou consists in a no el construo-l ,tion of the electrodesorcirouit-controllingjpors t construction of the contacts or eleotrodes fI emp l oyed for. making contact with the elem j nected with thediaphragm so asto be put in 1 ing M trodes.

tion of the instrun1ent,wh ereby the operation I ,ofthe instrumentintransmittingsounds is greatly improyed and theconstancy ofthe adjjustment increased, and whereby, also, the oc' currence of the hissing,sputtering, and other foreign sounds in the receiver, caused byabnormal'action of the transmitter, are largelyi ded 1, a: 5. [1.

Myinvention alsoconsists inothernovel feau s ef n tiuet' n, lat ieim repar icul r t et ji tine il r ee's and. the ean m-i p 'y' d fqrh din t eel c r e n po n, the nature offwhich will appearfrom thefollowq ingdescription; and the accompanying drawi l W Q j a l Figure l is a 'topor plan View of the instru-! ment, showing the front of thetransmitter-cas'f ingythe diaphragm, and the mouth-piece inf horizontalsection. Fig. 2 is a side View, show ing the supporting-rodfor thepivoted electrodes in section. Fig. 3 vshows'a modified 5 In telephonetrausmitters as heretofore usu-g ally constructed but one electrode hasbeeni trodeor contact which is attached to or con-t motion thereby, and:in 1 those instanceswhere i wockflmdes h be n u d re ing sp fth'e }i e h'ein; i r nes a e e emp yed? for compelling contact, and indcpendentadjust- 4 3 1 6 1 1W? be n u d fe zth t e t i mnrot k'fi ansi ier di e f oz pr o instrumentspfdtsclass in that-a multiplicity it Own ight shea hsd nh me ecirod while, fur

'i p r a eile e bsie m l ye res n aea nstth electrode connected with thediaphragm, @fichj electrode 'beingfreely pivoted so;as toresjt by ther,s

lect e harm qm m0 u, t

s ita le t cesrsath e t er- T e electr de th r are a] beingsymmetrically arranged, and each resting by its own weight upon thecommon electrodecarried by the diaphragm, the natural andlnormal contactis the same for all, whereas intheicase of spring-supportedelectrodesthere arie no-mejans of determining'the force which tendsto hold theelectrodes in contact with the diaphragm,and it is hence impossible tohave the same initial or normal contact for all. Moreover, as there is amultiplicity of" feet the operation of theginstrument, and as electrodesadefect in one will notseriously afthe'ele'ctrodes are hung upon acommon adjustable support theinitial force tending to h'OIdLthe n incontactcan be readily adjusted for allby one and the same adjustment.The form of the, pivoted or swinging electrodeemployedjis also peculiar,andis such thattan adjustment toincrease the initial tbrcetehding tohold it in contact, with thediaphragm-electrodewill also vary the angleof impingement ofjthe electrodecarried by the diaph ragm with thepivoted electrodes anddecrease the tendency of the latter to yield ormove under'the .action ofthe diaphragm-electrode.

. -Intheaccompanyingdrawings,Arepresents the frontof thetransmitter-casing, and B the mouth-piece.

DaiPIGSGI] ts the diaphragm clam ped against ,a'plate, G, of insulatingmaterial, by a screw or bolt-or other'suitable means.

1E isatmetal ringor washer bearingagainst the diaphragm. Theplate,diaphr;agm, and. washer are clamped against the inside face of the frontplate:

g representsja metalrod'projecting at angles from thejdiaphragm, andcarrying at its enda cross-arm, G, of any suitable material, whichconstitutes theelect-rode,oric ontact ati as to be putiu motion thereby.

tachedto orconnectedwith the diaphragm so 1 ,'At H is representedagseries pivoted plates, preferably of carbonized paper'or card- ;board,and strunginpo'n ametal rod, I, which is fixed in knobs K, of hardrubber or other insulating material, screwed uponthe ends of ;bolts ;L.jThe latterpass through the diaphragm and the front of thecasing,asshown, andare iprovidedwithgnuts M, whereby they may .beadjusted longitudinally backward and forward, carryin g withthemth'efreely-pi voted electrodes H. The under edge of the electrodes H, or theportion resting upon the rod G, is inclined, as shown, so that thelatterimpinges against the edges of electrodes H at an angle. As will beseen, any movement of the rod G forward will tend to raise the ends ofthe plates or electrode H. As shown in the This adjustment isaccomplished by means of the rods L and'bolts M. The same adjustmentserves also to vary the initial or normal force tending to bring theelectrodes H into contact with the rod G, since the 'nearer thesupport-s G and I are brought together the greater will i be the portionof the weight of the plates H resting upon therod G. It is obviousthatthe latter adjustment for degree of force with which contact is mademaybe still accomplished, al-

though the rods G and I are not in the same horizontal plane, and thatthe adjustment for angle of incidence or directness of contact, and

readiness with which the plates will yield to movementof G, may also bemade under such conditions. i

The plates H, as I have before remarked, are preferably of carbon formedby carbonizing card-board or other analogous material, after the manneremployed in making carbon strips from paper or card-board for theincandescent portion of electric lamps. They may, however, be formed inother ways; but I prefer to make them in the manner specified, since itis simple, and the plates, beinglight, give a delicate and sensitivecontact. I I do not, however, limit myself to carbon as the material forthe plates, since they may, if desired, be made of thin plates of anydesired metal-'-as for instance, platinum the electrode G being in thiscase preferably formed with its contact-surface of carbon, although I donot limit myself in the latter particular, nor do I desire to limitmyself, so far as the multiple-pivoted electrodes are concerned, to thepart-icular'form shown, it being feasible to use other constructions,since this portion of my invention consists in freely pivoting orsupporting a number of independ- I cut electrodes so that they will restby gravity a gainstaco'mmon electrode carried by the diaphragm, and alsoin pivoting or supporting a number of electrodes upon the same adjust"able piece."

The form of the electrode G, and the manner of attaching the same to thediaphragm, or supporting it so that it may be put in motion by thelatter, may also be varied in many ways.

I also wish it to be understood that the-devices for adjusting the partupon which the multiple electrodes are supported may be varied withoutdeparting from the'spirit of the invention.

The electrical connections for the instrument are made at the points I?and N, the latter being a binding-post upon the end of the metal rod I.The circuit is from N through I, electrodes H, electrode G, diaphragm D,and out at I.

In Fig. 3 is shown a modified construction of the electrodes. In thiscase the electrode S, attached to the diaphragm, has an inclined face,the pivoted gravity-electrode R resting upon the same at one corner. Inthis case the necessary adjustment would be made by mov ing the supportfor R in a verticalplane, although other methods of adjustment may beemployed.

What I claim as my invention is- 1. The combination, in a tele ih'onetransmitter, of a contact electrode carried by the diaphra gm, and aseries of independentlypivoted simple electrodes resting independentlyand by their own weight against the electrode can ried by the diaphragm.

2. A compound electrode for a telephonetransmitter, consisting of aseries of independently-yielding variable contact-electrodes, in

combination'with a common adjustable sup port for said electrodes.

3. A compound electrode for a telephonetransmitter, consisting ofanumber of simple freely-pivoted electrodes resting by the action ofgravity upon the opposite electrode, in combination with a commonadjustablesupport upon whichsaid electrodes are pivoted.

4. A compound electrode for a telephonetransmitter,'consistin g of aseries of. parallel independently-pivoted carbon plates fixedupo acommon support. a a

5. The combination of a series of parallel independently-pivoted carbonplates and an adjustable common support upon which said plates arepivoted.

6. Acompound electrode for telephones, consisting of a number ofparallel plates independently pivoted and resting with their edges uponthe opposite electrode. V

7. A compound electrode for a telephonetransmitter, consisting of anumber of parallel pivoted plates formed of carbonized card-board,paper, or equivalent material. I

- 8. An electrode for a telephone-transmitter, consist-ingof parallelplates struu g upon a conductingmod.

9. The combination, with an electrode connected with the diaphragm of atransmitter, and having a curved coutact-surface,of an electrodeconsisting of a thin sheet of conducting material'resting with its edgeagainst the'diaph'ragm electrode.

. 10. A contact-electrode for 'atelephone-transmitter, consisting of athin sheet of carbonized paperor thin'card-board,said electrode beingmounted so as torest with. its edge against the electrode with which itmakes contact.

IlO

11. Acontact-el-ectrode foratelephone-transtrode, and an adjustablesupport for the first electrode, all combined as described, so that byadjusting the support of the pivoted electrode the angle of impingementot' the second electrode may be varied.

13. The combination of a com pound electrode consisting ofa seriesofpivoted parallel plates,

an electrode connected to a diaphragm, against which electrode theparallel plates bear with inclined edges, and an adjustable support forsaid pivotedelectrodes, adjustable to and from I the electrode connectedwith the diaphragm.

14. The combination of a series of parallel pivoted plates, a cross-barconnected to a diaphragm, against which bar the edges of the pivotedplates rest, a conducting-bar upon which the pivoted plates are strung,and supportingrods for said conducting-bar, connected at right anglesthereto, and adjustable longitudinally.

15. The combination of rod E, attached to the diaphragm cross-bar G,pivoted plates H, resting upon thebar, with their lower edge inclinedthereto, rod I, and adj ustablc rods L, substantially as described.

16. The combination of a pivoted electrode, and an adjustable supportfor the same, adapted to be moved to and from the electrode againstwhich said pivoted electrode bears, so as to vary the initial pressurein the manner described by shifting the point upon the pivoted electrodeat which it makes contact and is par tially supported.

JOSEPH OLMSTED.

Witnesses:

H. G. TOWNSEND, THOMAS TOOMEY.

